I have no idea what it's like at TSA but a few questions to ask beyond hourly pay rates..

Duty guarantee
Premium Pay
Minimum daily guarantee and how it's figured
Trip rig
Hard lines or PBS
Average credit per day
Trip type or mix for the Denver domicile
How easy is it to change your schedule around (dropping/trading)
Vacation accrual/gold days

As far as SkyWest goes you can be based in COS and pick up trips in DEN or any other domicile as well. Possibly give away trips you don't want. PBS can allow for a lot of flexibility in building your schedule with some seniority. And if you get based in DEN I understand you will wind up doing Aspen flying in the 700.